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calculate RPL checksum right before sending the ICMP packet

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This commit is contained in:
Oleg Hahm 2013-11-20 23:41:21 +01:00
parent cce3432220
commit aaccd37a2f
1 changed files with 14 additions and 12 deletions
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26
sys/net/rpl/rpl.c
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@ -29,6 +29,7 @@
#include "trickle.h"
#include "sixlowpan.h"
#include "net_help.h"
#define ENABLE_DEBUG (0)
#if ENABLE_DEBUG
@ -268,6 +269,7 @@ void rpl_init_root(void)
void send_DIO(ipv6_addr_t *destination)
{
DEBUG("Send DIO\n");
mutex_lock(&rpl_send_mutex);
rpl_dodag_t *mydodag;
icmp_send_buf = get_rpl_send_icmpv6_buf(ipv6_ext_hdr_len);
@ -282,7 +284,6 @@ void send_DIO(ipv6_addr_t *destination)
icmp_send_buf->type = ICMPV6_TYPE_RPL_CONTROL;
icmp_send_buf->code = ICMP_CODE_DIO;
icmp_send_buf->checksum = ~icmpv6_csum(IPV6_PROTO_NUM_ICMPV6);
rpl_send_dio_buf = get_rpl_send_dio_buf();
memset(rpl_send_dio_buf, 0, sizeof(*rpl_send_dio_buf));
@ -311,34 +312,33 @@ void send_DIO(ipv6_addr_t *destination)
rpl_send_opt_dodag_conf_buf->default_lifetime = mydodag->default_lifetime;
rpl_send_opt_dodag_conf_buf->lifetime_unit = mydodag->lifetime_unit;
opt_hdr_len += RPL_OPT_LEN + RPL_OPT_DODAG_CONF_LEN;
uint16_t plen = ICMPV6_HDR_LEN + DIO_BASE_LEN + opt_hdr_len;
rpl_send(destination, (uint8_t *)icmp_send_buf, plen, IPV6_PROTO_NUM_ICMPV6, NULL);
rpl_send(destination, (uint8_t *)icmp_send_buf, plen, IPV6_PROTO_NUM_ICMPV6);
mutex_unlock(&rpl_send_mutex);
}
void send_DIS(ipv6_addr_t *destination)
{
DEBUG("Send DIS\n");
mutex_lock(&rpl_send_mutex);
icmp_send_buf = get_rpl_send_icmpv6_buf(ipv6_ext_hdr_len);
icmp_send_buf->type = ICMPV6_TYPE_RPL_CONTROL;
icmp_send_buf->code = ICMP_CODE_DIS;
icmp_send_buf->checksum = ~icmpv6_csum(IPV6_PROTO_NUM_ICMPV6);
rpl_send_dis_buf = get_rpl_send_dis_buf();
uint16_t plen = ICMPV6_HDR_LEN + DIS_BASE_LEN;
rpl_send(destination, (uint8_t *)icmp_send_buf, plen, IPV6_PROTO_NUM_ICMPV6, NULL);
rpl_send(destination, (uint8_t *)icmp_send_buf, plen, IPV6_PROTO_NUM_ICMPV6);
mutex_unlock(&rpl_send_mutex);
}
void send_DAO(ipv6_addr_t *destination, uint8_t lifetime, bool default_lifetime, uint8_t start_index)
{
DEBUG("Send DAO\n");
if (i_am_root) {
return;
}
@ -359,7 +359,6 @@ void send_DAO(ipv6_addr_t *destination, uint8_t lifetime, bool default_lifetime,
icmp_send_buf->type = ICMPV6_TYPE_RPL_CONTROL;
icmp_send_buf->code = ICMP_CODE_DAO;
icmp_send_buf->checksum = ~icmpv6_csum(IPV6_PROTO_NUM_ICMPV6);
if (my_dodag == NULL) {
mutex_unlock(&rpl_send_mutex);
@ -423,7 +422,7 @@ void send_DAO(ipv6_addr_t *destination, uint8_t lifetime, bool default_lifetime,
opt_len += RPL_OPT_TRANSIT_LEN + 2;
uint16_t plen = ICMPV6_HDR_LEN + DAO_BASE_LEN + opt_len;
rpl_send(destination, (uint8_t *)icmp_send_buf, plen, IPV6_PROTO_NUM_ICMPV6, NULL);
rpl_send(destination, (uint8_t *)icmp_send_buf, plen, IPV6_PROTO_NUM_ICMPV6);
mutex_unlock(&rpl_send_mutex);
if (continue_index > 1) {
@ -433,6 +432,7 @@ void send_DAO(ipv6_addr_t *destination, uint8_t lifetime, bool default_lifetime,
void send_DAO_ACK(ipv6_addr_t *destination)
{
DEBUG("Send DAO ACK\n");
rpl_dodag_t *my_dodag;
my_dodag = rpl_get_my_dodag();
@ -445,7 +445,6 @@ void send_DAO_ACK(ipv6_addr_t *destination)
icmp_send_buf->type = ICMPV6_TYPE_RPL_CONTROL;
icmp_send_buf->code = ICMP_CODE_DAO_ACK;
icmp_send_buf->checksum = ~icmpv6_csum(IPV6_PROTO_NUM_ICMPV6);
rpl_send_dao_ack_buf = get_rpl_send_dao_ack_buf();
rpl_send_dao_ack_buf->rpl_instanceid = my_dodag->instance->id;
@ -454,7 +453,7 @@ void send_DAO_ACK(ipv6_addr_t *destination)
rpl_send_dao_ack_buf->status = 0;
uint16_t plen = ICMPV6_HDR_LEN + DAO_ACK_LEN;
rpl_send(destination, (uint8_t *)icmp_send_buf, plen, IPV6_PROTO_NUM_ICMPV6, NULL);
rpl_send(destination, (uint8_t *)icmp_send_buf, plen, IPV6_PROTO_NUM_ICMPV6);
mutex_unlock(&rpl_send_mutex);
}
@ -886,8 +885,7 @@ void recv_rpl_dao_ack(void)
}
/* TODO: tcp_socket unused? */
void rpl_send(ipv6_addr_t *destination, uint8_t *payload, uint16_t p_len, uint8_t next_header, void *tcp_socket)
void rpl_send(ipv6_addr_t *destination, uint8_t *payload, uint16_t p_len, uint8_t next_header)
{
uint8_t *p_ptr;
ipv6_send_buf = get_rpl_send_ipv6_buf();
@ -904,6 +902,10 @@ void rpl_send(ipv6_addr_t *destination, uint8_t *payload, uint16_t p_len, uint8_
memcpy(&(ipv6_send_buf->destaddr), destination, 16);
ipv6_iface_get_best_src_addr(&(ipv6_send_buf->srcaddr), &(ipv6_send_buf->destaddr));
icmp_send_buf = get_rpl_send_icmpv6_buf(ipv6_ext_hdr_len);
icmp_send_buf->checksum = 0;
icmp_send_buf->checksum = ~ipv6_csum(ipv6_send_buf, (uint8_t*) icmp_send_buf, ipv6_send_buf->length, IPV6_PROTO_NUM_ICMPV6);
/* The packet was "assembled" in rpl.c. Therefore rpl_send_buf was used.
* Therefore memcpy is not needed because the payload is at the
* right memory location already. */